Thanks James. I thought with Quartz you could do up to 16"? With his slightly modified design i think the 2x2 tubing is now 12" from edge (putting on outside cabinets/half wall).

“Supportoft” isn’t always stable, when you have a small center one. It’s called a lever. Go wider and deeper, and you don’t have any chances of Big Bubba leaning on it, to overbalance the pivot point.

A 2" tube isn't big enouygh for the center post either. It needs to be at least 4" around, to both support, and be proportionate.